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I want to install Oracle8.1.5 to Sun Solaris 2.7(Sparc), but after I added the parameter to the /etc/system of file, there allways come with the error of 'not defined the shmsys' while OS starting up. How can i work out of it? thanks.

I would suggest you read the installation manual for the definitions (downloadable from technet) to ensure your system is configured correctly
eg number of semaphores - which could differ depending on the application your running.
However, below are the lines I've entered for my installation and I've had no problems.

set shmsys:shminfo_shmmax=4294967295
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=200
set shmsys:shminfo_shmseg=200
set semsys:seminfo_semmni=300
set semsys:seminfo_semmsl=150
set semsys:seminfo_semmns=300
set semsys:seminfo_semopm=200
set semsys:seminfo_semvmx=32767

ORA-01012: NOT LOGGED ON

Thank you all!
I just changed my display and the Shared Memory parameter is set correctly. but there is another error occured with 'ORA-01012:NOT LOGGED ON', I have no ideas about it now, I was wondering if I could appeal to your good nature and ask you to help me out. TIA.